Gear cutting – milling – or planing – Milling – Process
Patent
1992-08-13
1994-02-22
Briggs, William
Gear cutting, milling, or planing
Milling
Process
219119, 409140, 409181, B23C 120, B23K 1130
Patent
active
052881857
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and a device for dressing truncated conical tips on electrodes in a spot welding machine or the like. In the process, each electrode tip is dressed or reconditioned by insertion in a cavity in a tool for machining the tip. The device comprises a tool mounted on a frame for machining the electrode tips, said tool consisting of a motor driven, rotating tool with at least one truncated conical cavity of a shape corresponding to the shape of the truncated conical lateral surface of the electrode tip.
In spot welding, it is important that the tips of the electrodes in the spot welding machine has the correct shape and size to produce high quality welds. During welding, the electrode tips are subjected to wear and pick-up. In order to maintain high quality of the spot welds, the electrode tips, after a predetermined number of welds, must be dressed or reconditioned so that they maintain the correct shape and dimensions. This can be done manually by filing or grinding, or the electrodes can be dressed in a motor driven dressing device. Such devices are used with advantage for dressing the tips of electrodes in spot welding guns or other machines operated by means of industrial robots. The robot can be programmed, after a predetermined number of welds, to move the spot welding gun to the dressing device, whereupon the dressing operation is initiated.
It is known, in automatic dressing, to use a tool mounted on a frame with two oppositely directed, conical cavities with rotating milling tools. The milling tools are set in rotation and the electrodes of the spot welding machine are each inserted into an individual cavity, whereupon the spot welding gun is used to provide a clamping force which is only a fraction of the clamping force used during welding.
The result of the dressing operation depends on the clamping force of the welding gun and the length of the dressing period. It is difficult to regulate these parameters to achieve an acceptable final result. If the clamping force is too high and/or the dressing period is too long, more material than is necessary is machined off the electrodes, which unnecessarily increases electrode use. The shape of the electrodes may also become incorrect, leading to poor weld quality.
A dressing method has also been suggested where the electrode tips are inserted one at the time into a cavity in a tool, the electrode being pressed against the tool with a force which is balanced by the fact that the tool is spring-biased in the opposite direction. Here too, however, the dressing result will be dependent on the period during which the tool works.
The purpose of the present invention is to provide a process and a device of the type described by way of introduction, whereby the process and the device remove the above mentioned disadvantages of previously known processes and devices and make possible maximum use of the welding electrodes at the same time as high welding quality is maintained. this is achieved according to the invention by a process of the type described by way of introduction which has the features disclosed in the characterizing clause of claim 1, and a device of the type described by way of introduction which has the features disclosed in the characterizing clause of claim 4.
The invention will be described in more detail below with reference to the accompanying drawings, which show one embodying example.
FIG. 1 is a somewhat schematic plan view of a device according to the invention,
FIG. 2 shows a section along the line II--II in FIG. 1,
FIG. 3 shows a section on a larger scale through a tool in the device according to FIGS. 1 and 2,
FIG. 4 is a plan view of the tool in FIG. 3, and
FIG. 5 shows a section along the line V--V in FIG. 1.
The drawings show a device according to the invention for dressing truncated conical tips of electrodes in a spot welding gun or press, and the device shown in the drawings is designed for simultaneous dressing of the opposing tips of two electrodes 1 and 2, which are mounted in a spot welding gun
REFERENCES:
patent: 2418767 (1947-04-01), Hall
patent: 2930289 (1960-03-01), Swarts
patent: 3128672 (1964-04-01), O'Connor et al.
patent: 3820437 (1974-06-01), Dyer et al.
AB Volvo
Briggs William
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